Mineral chemistry dataset of the Tournaisian – Lower Viséan submarine basaltic volcanism of the Matachel Basin (SW Iberian Massif).

Sarrionandia, F.; Errandonea-Martin, Jon; Larrondo, E; Carracedo-Sánchez, M.; Ábalos, B.; Gil-Ibarguchi, J.I.

doi:10.1016/j.dib.2022.108826

Cited by 2 publications

(12 citation statements)

References 14 publications

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“…By contrast, actinolite and magnesiohornblende are characterized by wider ranges of cation site occupancy, with (Na + K) A = 0.07–0.32 a.p.f.u., Al IV = 0.35–0.71 a.p.f.u., low Ti contents (0.03–0.13 a.p.f.u.) and Mg/(Mg + Fe 2+ ) ratios (0.58–0.73) close to those of titanian magnesiohastingsites (Sarrionandia et al., 2023). In general, amphiboles from the studied gabbros are poor in Cr (<0.03 a.p.f.u.)…”

Section: Petrography and Mineral Chemistrysupporting

confidence: 62%

“…In the diorites, clinopyroxene appears transformed to ferropargasitic amphibole. Compositional zoning has not been observed (Sarrionandia et al., 2023). Clinopyroxene structural formulae correspond to the Ca–Mg–Fe type of Morimoto (1988), with similar augite compositions in the gabbros (Wo 37–41 En 36–46 Fs 8–15 ) and in the lava‐flows (Wo 31–39 En 32–49 Fs 7–22 ; Figure 4a).…”

Section: Petrography and Mineral Chemistrymentioning

confidence: 99%

“…Clinopyroxene structural formulae correspond to the Ca–Mg–Fe type of Morimoto (1988), with similar augite compositions in the gabbros (Wo 37–41 En 36–46 Fs 8–15 ) and in the lava‐flows (Wo 31–39 En 32–49 Fs 7–22 ; Figure 4a). The analyzed augites possess relatively high Mg# values (0.61–0.88 in lava‐flows, 0.71–0.85 in gabbros) and exhibit wide variations in TiO 2 (0.47–3.54 wt.%) and Cr 2 O 3 (0–0.72 wt.%) contents (Sarrionandia et al., 2023).…”

Section: Petrography and Mineral Chemistrymentioning

confidence: 99%

“…Occasionally they exhibit radial arrangements. Rare alkali feldspar (orthoclase, Or 93–97 ; Deer et al., 1963) has been observed as micro‐phenocrystals (an interstitial phase from the mesostasis) only in one basic lava‐flow (intermediate composition pillow‐lava sample VFB‐9) with a ∼28% modal proportion (Sarrionandia et al., 2023). In intrusive gabbro and diorite rocks, it is an accessory phase restricted to the groundmass.…”

Section: Petrography and Mineral Chemistrymentioning

confidence: 99%

“…Mineral chemical data are available (Open Access) in Sarrionandia et al. (2023). Studied rock samples are available in the Faculty of Science and Technology of Campus de Lejona (mailto:fernando.sarrionandia@ehu.eus).…”

Section: Data Availability Statementmentioning

confidence: 99%

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Low–Ti Continental Tholeiite Origin of Magmas With Calc‐Alkaline Signature in Transcurrent Settings: The Mississippian Matachel Volcanic Field (SW Iberian Massif)

Sarrionandia,

Errandonea‐Martin,

Larrondo

et al. 2023

Geochem Geophys Geosyst

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In the Mississippian Matachel small volcanic field of the Ossa‐Morena Zone (southern Iberian Massif) outpoured basic‐intermediate lavas exhibit geochemical characteristics of Low‐Ti continental tholeiites and calc‐alkaline lavas. Low‐Ti continental tholeiites integrate two contrasting groups of rocks: basalts (Mg#: 54 to 70; Ti/Zr: 61–79; LaN/LuN: 1.6–2.9; εNdi: +4.0–+6.6; “Group #1”), and basalts and basaltic andesites (Mg#: 43 to 66; Ti/Zr: 36–58; LaN/LuN: 2.5–5.9; εNdi: −0.2–+3.5; “Group #2”). Primitive Group #1 tholeiitic magmas were generated by partial melting of a garnet‐free lherzolite from an enriched lithospheric mantle, near the lithosphere‐asthenosphere thermal boundary layer (with a very limited asthenosphere melting input). Progressive interaction of these magmas with crustal alkali igneous rocks resulted in the formation of the petrological evolutionary trends observed, to a larger extent in the case of Group #2 Low‐Ti tholeiites. Further assimilation of amphibole‐rich calc‐alkaline metaigneous rocks might have originated the basalts and basaltic andesites with calc‐alkaline signature (Mg#: 33 to 56; Ti/Zr: 25–78; LaN/LuN: 2.0–5.6; εNdi: +2.8–+4.8). These exhibit a “Cordilleran‐type” evolutionary trend, though are unrelated to plate convergence. The magmas with calc‐alkaline signature attest to a closed‐system differentiation process controlled by the fractionation of plagioclase, clinopyroxene, magnetite and ilmenite. It is proposed that Mississippian lithospheric‐scale intra‐continental wrenching, unrelated to coeval mantle plume upwelling, reworked complexly docked mantle domains and triggered mantle melting. Enduring mid‐upper crustal processes (magma storage in mid‐crustal chambers and crustal assimilation) likely shaped the latest petrologic and geochemical aspects of the Matachel Low‐Ti tholeiites and related rocks with calc‐alkaline signature.

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Section: Petrography and Mineral Chemistrysupporting

confidence: 62%

Section: Petrography and Mineral Chemistrymentioning

confidence: 99%